Wednesday, May 9, 2012

Android Layout Background Issue

First of all, make sure that your original image looks good so you're not just getting the problem from there.
Then, in your onCreate() method, do:
And to load your image explicitly as a 32-bit image (RGBA-8888 configuration) add the following where you load your views:

BitmapFactory.Options options = new BitmapFactory.Options();
options.inPreferredConfig = Bitmap.Config.ARGB_8888;
Bitmap gradient = BitmapFactory.decodeResource(getResources(), R.drawable.gradient, options);

findViewById( BitmapDrawable(gradient));

Comparison between different approaches: (these are all screenshots from the resulting application)
My source images (64 colors to the left, 24 bit to the right):
image1 and image2:
64-color24 bit
1: Raw 64-color image (image1) set as background from layout XML:
Raw image
2: The same image (image1), using code1:
Dithered image
3: The same image (image1) using both code1 and code2:
explicit 32bit
4: image2, loaded with code1 and code2 (in this case the dithering is not really important as both the source and destination use 8 bits per color):
higher original quality
Notice how the resulting artifacts in image 3 already exists in the original image.

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